British Journal of Nutrition

Nutritional Toxicology

Studies with low micromolar levels of ascorbic and dehydroascorbic acid fail to unravel a preferential route for vitamin C uptake and accumulation in U937 cells

Catia Azzolinia1, Mara Fiorania1 c1, Andrea Guidarellia1 and Orazio Cantonia1

a1 Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino “Carlo Bo”, Via Saffi, 2, 61029 Urbino (PU), Italy

Abstract

Mammalian cells accumulate vitamin C either as ascorbic acid (AA), via Na+–AA co-transport, or dehydroascorbic acid (DHA, the oxidation product of AA), via facilitative hexose transport. As the latter, unlike the former, is a high-capacity transport mechanism, cultured cells normally accumulate greater levels of vitamin C when exposed to increasing concentrations of DHA as compared with AA. We report herein similar results using the U937 cell clone used in our laboratory only under conditions in which DHA and AA are used at concentrations greater than 50–60 μm. Below 60 μm, i.e. at levels in which AA is normally found in most biological fluids, AA and DHA are in fact taken up with identical rates and kinetics. Consequently, extracellular oxidation of AA switches the mode of uptake with hardly any effect on the net amount of vitamin C accumulated. As a final note, under these conditions, neither AA nor DHA causes detectable toxicity or any change in the redox status of the cells, as assessed by the reduced glutathione/reduced pyridine nucleotide pool. These findings therefore imply that some cell types do not have a preferential route for vitamin C accumulation, and that the uptake mechanism is uniquely dependent on the extracellular availability of AA v. DHA.

(Received January 24 2011)

(Revised April 27 2011)

(Accepted May 31 2011)

(Online publication July 28 2011)

Correspondence:

c1 Corresponding author: Dr M. Fiorani, fax +39 722 305324, email mara.fiorani@uniurb.it

Footnotes

Abbreviations: AA, ascorbic acid; DHA, dehydroascorbic acid; DHR, dihydrorhodamine 123; DTT, dithiothreitol; GSH, reduced glutathione; RPMI, Roswell Park Memorial Institute

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